SizeOn Maximum Performance
Gaspari Nutrition

SizeOn Maximum Performance

With Outlast Carbohydrate Matrix!
Hybrid Intra-Workout Whey Hydrolysate Creatine Formula!
8.6 out of 10 (424 Reviews)
1 Size
3.59 Lbs.
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4 Flavors
Grape Cooler
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Competitor Price: $53.99
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Our Price: $42.63 ($1.78 / Serving)
Flavor Rating: 7.7

Product Overview

Bottle Lines
4g L-Leucine
Per serving
Inhibits Muscle Protein Breakdown.
Key Benefits:
  • Accelerates Protein Synthesis & Muscle Force Recovery*
  • Increase Muscle Volume, Muscle Fiber Size, Cell Volume & Plasma Amino Acid Levels*
  • Includes Highly Branched Cyclic Dextrin Infused Carbohydrate Blend
SIZEON ® is the most recent breakthrough in Creatine science. Using a tri-phase Creatine blend to offer unmatched bioavailability, absorption, and digestion, SIZEON will prime your body for more explosive strength and power gains than ever before.* SIZEON also includes an industry leading 4g of L-Leucine for maximal anabolism during and after training, as well as AmmoJECT to help with lactic acid build up in muscle tissue created during training.*
Empowering Real People With Real Science
Gaspari Nutrition represents the ultimate bridge between clinical science and real world results. Offering the most cutting edge and innovative ingredients & formulas available, Gaspari Nutrition gives you an advantage on the competition like nothing else can. This advantage begins with premium quality raw materials and extends into our unrivaled cGMP certified manufacturing facility. Once it is in your hands, you will have the most tested, tried and proven supplements to help you take your training and physique to the next level.

Ratings & Reviews

Overall Rating
424 Ratings
Verified Buyer Rating
69 Ratings
Average Flavor Rating
4 Flavors
Top Rated Flavor
Lemon Ice
By clicking the button above, you agree to entering the Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
  • 10 Orange Cooler

SIZEON is an intimidatingly massive intraworkout product that leads with 40 grams of carbohydrates and 7 grams of protein. The carbohydrate complex is a mixture of three carb sources, but it is mostly 39 grams of trehalose and dextrose, which are simple carbs. Would love to see more cyclic dextrin in the blend, but still great to have the nice dose of carbs. The 7 grams of protein are from Whey Protein Hydrolysate, which is a quality protein source. The rest of the formula is BCAAs, creatine, taurine, and electrolytes and vitamins. There is no way around it: the formula is massive! It hits everything you could want or need in an intraworkout. I have loved using SIZEON!! It is such a delicious flavor for one. The orange cooler is essentially a slightly sweeter and thicker orange juice. I typically use in 24 oz of water and refill with water after drinking half during a workout. The carbs are really sustaining, helping me endure long, grueling workout. SIZEON has really opened my eyes to the importance of carbs before/during workouts. Sometimes I feel like I even burn through the 40 grams of carbs in SIZEON too quickly. SIZEON has really been a great part of my workouts, and I think has helped me improve size and strength during use. The profile, flavoring, and performance effects are all clearly 10s out of 10s. The price per serving is a little high at $1.78 - would love to see it around $1.50 per serving though the formula is huge. I definitely think grabbing a tub of SIZEON is worthwhile, especially if on sale.

Verified Buyer
  • 10 Lemon Ice
  • 10 Wild Berry Punch
  • 9 Orange Cooler

First of all I'™d like to that dougefresh93 and Gaspari for putting on the Super Bowl Squares promo!!! Also thanks to the Patriots for beating the Failcons, in such an awesome way. I received my tube of Artic Lemon Ice on 2/15/17 and have used it exclusively as my intra-workout drink since then. BTW, I am almost out so I'll be ordering more. Guess that tells you how this review is going to go. At 190 calories with 40g of total carbohydrates, 7g of protein and multiple forms of creatine it is a great package of everything I want and need. The Artic Lemon Ice taste amazing as I mixed it with 40oz of water and sipped it during my workouts. Over the last month my calculated 1RM in the following lifts have increased as follows (in pounds). I am 5'™10" @ 175lbs. Deadlifts 200 -> 270 OHP 135 -> 145 Squat 160 -> 175 Bench 215 -> 230 Now, I have just added deads and squats to my routine over the last few months. I had avoided them because of 4 major back surgeries, but I'™ve checked my ego and started slow. Physically I feel like I look fuller, muscle mass wise. I feel plenty of stamina during my workouts and I feel as though I leave it all on the table by the time I am done in the gym!! This personal success (in my eyes) has lead me to keep SizeOn as my intra-workout and also got me to try SuperPump 250 (highly recommend). Thanks again!!


This is a great product for someone looking to put some "Size-On"; complete with intra-workout carbs, BCAA's, creatine, and much more! I didn't ever used intra-workout carbs in the past, but have become very fond of them. I just do a half scoop, but feel the intra-workout carbs really give me a boost in energy to push through tough sessions. I wish the flavor was perhaps a bit more sweet/refreshing, like classic lemonade, but it is still pretty good - definitely still enjoyable. Overall, probably not something I would use while dieting, but if you are looking for a nice pre/intra-workout to boost your energy without the caffeine this is a great product. I really enjoyed using it.


In my years of fitness I've generally kept products like SizeOn as a post workout. So what I did instead was spent several workouts using it as a post workout, and then several as it was designed, an intra-workout. What I found was that, as strictly a Post Workout drink, it pulls you right out of your fatigue, especially when you mix it with some protein. I used Arctic lemon and a vanilla protein powder....great combo. Now, when using it as intra-workout, I didn't necessarily notice anything significant, but certainly the added carbs and sugars were a nice departure from just water. I won't say it didn't help, but with all the other stuff I take before training, it's hard to pin down what SizeOn can do during a session. Now, here's the tricky bit- I just started my cut for summer, and the carbs in one serving makes juggling macros hard for me only because I love to inatead I cut the dose a little. I know that takes away from efficacy but I found that if I take this strictly post-workout during my cut, I get all the benefits of the pick-me-up with less carbs, and I still feel great afterwards. I highly recommend the Lemon, especially because it works very well with vanilla flavored mixers and add-ons...


The flavor is delicious! Especially when mixed with ice cubes. I usually took it while preparing for my heavy sets of 5-3-1. Mixes very well and helped me gain about ~7 LB's in 2 months with over 60 LB's to my max's on big 3. Highly recommend this product! You don't feel hungry during the workout which used to be an issue for me

† This price is the retail price for this product found at one or more retail websites in the last 30 days. The price may not include shipping cost, tax, sale or promotional prices, or discounts such as member pricing. Prices may change. verifies this price every 30 days.
3.59 Lbs.
3.59 Lbs.
24 Servings | $1.78 Per Serving

What's in Gaspari Nutrition SizeOn Maximum Performance

3.49 Lbs. Grape Cooler
Serving Size 1 Scoop (68 g)
Servings Per Container24
Amount Per Serving % Daily Value ‡
Calories 190       
Calories From Fat 0       
Total Fat 0 g 0%
Cholesterol 15 mg 5%
Total Carbohydrate 40 g 13%
Dietary Fiber 0 g 0%
Sugars (From Trehalose and Dextrose) 39 g **
Protein 7 g 14%
Vitamin C (As Ascorbic Acid) 60 mg 100%
Thiamin (As Thiamin Hydrochloride) 10 mg 667%
Riboflavin (As Riboflavin-5-Phosphate) 7.6 mg 447%
Niacin (As Niacinamide) 50 mg 250%
Folate (As Folic Acid) 200 mcg 50%
Vitamin B12 (As Methylcobalamin) 75 mcg 1,250%
Pantothenic Acid (As D-Calcium Pantothenate) 9 mg 92%
Calcium 51 mg 5%
Phosphorus 65 mg 7%
Magnesium 45 mg 11%
Sodium 235 mg 10%
Trehalose, Dextrose, Cyclic Dextrin, Pterostibene
Whey Protein Hydrolysate, L-Leucine (4g), L-Isoleucine, L-Valine
Creatine Monohydrate, Creatine MagnaPower® (Magnesium Creatine Chelate), Disodium Creatine Phosphate
L-Taurine, Sodium Glycerophosphate, Calcium Glycerophosphate, Potassium Glycerophosphate, Sustamine™ (L-Alanyl-L-Glutamine), Magnesium Glycyl Glutamine
‡ Percent Daily Values are based on a 2,000 calorie diet
** Daily Value not established
Other Ingredients:
Malic Acid, Citric Acid, Silica, Natural And Artificial Flavors, Salt, FD&C Red #40 Lake, Acesulfame Potassium, Sucralose, FD&C Blue #1 Lake.
Allergens: Contains ingredients from milk and soy.

Directions For SizeOn Maximum Performance: SizeOn® is meant to be taken once per day, on training days WHILE you train, 5 - 6 days per week. Mix one scoop in 20-30 ounces of cold water and sip throughout your workout. Should the need arise, add more water as necessary throughout your workout for proper hydration.

Warnings: Seek the advice of a health care practitioner before use. Not Suggested for use in children under the age of 18 or in people who have been diagnosed with hypertension, kidney disease, liver disease, metabolic syndrome, diabetes, neoplastic condition such as cancer or thalassemia. Do not use if pregnant or nursing. KEEP OUT OF REACH OF CHILDREN.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.